桩端沉渣对钻孔灌注桩承载性能影响数值模拟研究  

Numerical Simulation Research on Influence of Pile Tip Sediment on Bearing Capacity of Bored Pile

作　　者：林梦果 黄雪林 韩冬冬 石海洋 LIN Meng-guo;HUANG Xue-Lin;HAN Dong-dong;SHI Hai-yang(Department of Transportation of Yunnan Province,Kunming 650108,China;Suqian High Speed Railway Construction Development Co.Ltd.,Suqian 223814,China;CCCC Highway Bridges National Engineering Research Centre Co.Ltd.,Beijing 100088,China)

机构地区：[1]云南省交通运输厅,昆明市650108 [2]宿迁市高速铁路建设发展有限公司,宿迁市223814 [3]中交公路长大桥建设国家工程研究中心有限公司,北京市100088

出　　处：《公路》2021年第6期116-122,共7页Highway

摘　　要：为研究桩端沉渣对钻孔灌注摩擦桩承载及受力性能的影响,基于有限元数值方法,建立有桩端沉渣的钻孔灌注单桩桩土相互作用有限元数值模型,分别以桩端沉渣厚度、沉渣模量作为变量,从荷载沉降关系、桩身压缩、荷载分担比等方面,定量分析研究普通钻孔灌注摩擦型桩基承载特性受沉渣影响的规律。研究结果表明,沉渣的厚度及模量对桩基承载力具有显著影响,桩端沉渣越厚,或沉渣模量越低,则桩端土体刚度越小,桩端土体可提供的承载能力越低,桩基极限承载力越低。实际工程中,宜从提高清渣工效、降低沉渣厚度,并适当改善桩端沉渣力学性能来提升并保证钻孔灌注桩安全性能。In order to study the influence of pile tip sediment on the bearing capacity and mechanical performance of bored friction pile,a finite element numerical model of pile-soil interaction of bored single pile with pile tip sediment is established based on the finite element numerical method,taking the thickness of pile tip sediment and the sediment modulus as variables,the influence of sediment on bearing characteristics of common bored friction pile foundation is studied quantitatively from the aspects of loadsettlement relationship,pile compression and load-sharing ratio.The results show that the thickness and modulus of sediment have a significant impact on the bearing capacity of pile foundation,the thicker the sediment or the lower the sediment modulus,the lower the stiffness of pile tip soil,the lower the bearing capacity provided by pile tip soil and the lower the ultimate bearing capacity of pile foundation.In practice,it is advisable to improve the efficiency of slag removal,reduce the thickness of sediment,and appropriately improve the mechanical properties of pile tip sediment to enhance and ensure the safety performance of bored cast-in-place piles.

关 键 词：桩基工程 桩端沉渣 沉渣厚度 沉渣模量 极限承载力 影响研究 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]